A rendering shows how the Warriors' proposed 13-story arena on Piers 30-32 will block San Francisco's waterfront.
Photo: Michael Macor, The Chronicle

A rendering shows how the Warriors' proposed 13-story arena on...

The Golden State Warriors' arena proposal for the San Francisco waterfront. Proposition B would limit high-rise development.

Photo: Sn¿hetta And AECOM/Golden State

The Golden State Warriors' arena proposal for the San Francisco...

Pier 30 seen in San Francisco. The San Francisco fire department officials are speculating on building a new fireboat station on the north side of a refurbished Piers 30-32 alongside the $1 billion sports and entertainment arena project from the Golden State Warriors.

Photo: Liz Hafalia, The Chronicle

Pier 30 seen in San Francisco. The San Francisco fire department...

The Golden State Warriors' initial arena proposal has part of the arena jutting out over the eastern edge of Piers 30-32 and doesn't leave enough room along that side to berth a cruise ship. (Rendering courtesy of Golden State Warriors)

The Golden State Warriors' initial arena proposal has part of the...

The Golden State Warriors' arena proposal for the San Francisco waterfront includes a 17,500-seat venue on the southeast corner of Piers 30-32, warehouse-like retail buildings along the Embarcadero, and roughly eight acres of terraced parks and plazas in-between.

Photo: Sn¿hetta And AECOM/Golden State

The Golden State Warriors' arena proposal for the San Francisco...

Golden State Warriors basketball team owner, Joe Lacob, far left, NBA Commissioner David Stern, San Francisco Mayor Ed Lee and Warriors executive Peter Guber, as they officially announce plans, on Tuesday May 22, 2012, in San Francisco,Ca., to build a new arena on Piers 30 and 32 in time for the start of the 2017-2018 NBA season.

Photo: Michael Macor, The Chronicle

Golden State Warriors basketball team owner, Joe Lacob, far left,...

An artists sketch showing the Golden State Warriors proposed new basketball arena is displayed with the San Francisco-Oakland Bay Bridge in the background in San Francisco, Tuesday, May 22, 2012. The Warriors unveiled plans to build an arena at Piers 30-32. The waterfront site is just blocks from the San Francisco Giants' ballpark and the downtown financial district. The arena is expected to be completed by 2017.

Photo: Eric Risberg, Associated Press

An artists sketch showing the Golden State Warriors proposed new...

Renderings of the Warriors stadium at piers 30-32. Concept by Future Cities. View of concourse.